Pump connector rod link



July 24, 1962 R. w. BOEHLOW PUMP CONNECTOR ROD LINK Filed NOV. 28, 1958 INVENTOR. ROBERT W. BOEHLOW F IG.3. F ICE/4.

ATTORNEY Unite States Patent 3,045,505 PUMP CUNNECTOR RG1) LINK Robert W. Boehlow, Pagedale, Mm, assignor to ACE Industries, Incorporated, New York, N.Y., a corporation of New Jersey Filed Nov. 28, 1958, Ser. No. 776,911 2 Claims. ((11. 74469) This invention relates to mechanical linkages, and more particularly to mechanical linkages such as are used in carburetors for internal combustion engines.

It will be understood that a carburetor may be provided with an accelerating pump for pumping fuel from the usual fuel bowl of the carburetor to a mixture conduit of the carburetor upon acceleration. Such a pump usually comprises a pump plunger reciprocable in a pump cylinder actuated by a linkage from the usual throttle lever of the carburetor. This linkage usually comprises a rocker pivoted on the air horn section of the carburetor, with a link connecting the throttle lever and one end of the rocker and another link connecting the other end of the rocker to the end of the pump plunger. Heretofore, it has been the practice to make the link connecting the rocker and pump plunger with end portions bent to extend laterally in the same direction from the link, these end portions being received in a hole in the rocker and a lateral hole in the link, at least one of these end portions having an annular groove machined therein for receiving a hairpin spring clip to hold the link in place. This type of link, apart from undesirably requiring a machining operation to provide the groove, has also had the disadvantage that occasionally the spring clip would become loose and fall off, thereby allowing the link to become disengaged from the plunger and the rocker and fall out, resulting in discontinuation of operation of the pump.

Accordingly, it is an object of this invention to provide in a linkage such as above described, a novel type link for connecting the rocker and the pump plunger which is so formed as to be inherently held against disengagement from either the rocker or the plunger without requiring any auxiliary fastener such as a clip, which is economical to manufacture, not requiring any machining operation such as the groove-forming operation required in manufacturing the prior type of link, and which is easy to assemble with the rocker and plunger.

According to the invention as it applies to connection of the pump rocker arm and the pump plunger, the rocker arm and plunger are each formed with a hole therein.

The link connecting these elements is formed with end portions extending laterally in opposite directions, one of said end portions being received in the hole in the rocker and the other end portion being received in the hole in the plunger, the link being laterally engageable with the rocker to prevent disengagement of its said other end portion from the plunger, and laterally engageable with the plunger to prevent disengagement of its said one end portion from the rocker.

The invention is also applicable to carburetor linkages other than the accelerating pump linkage. It is useful,

for example, in a multistage carburetor such as the socalled four barrel carburetor which has a primary throttle shaft and a secondary throttle shaft for connecting an arm on the primary throttle shaft to an arm on the secondary throttle shaft. The invention may also have applications in devices other than carburetors for connecting two relatively movable elements of a linkage. Other objects and features will be in part apparent and in part pointed out hereinafter.

The invention accordingly comprises the constructions hereinafter described, the scope of the invention being indicated in the following claims.

In the accompanying drawings, in which several possible embodiments of the invention are illustrated,

FIG. 1 is a View in elevation of one side of a carburetor, with parts broken away, utilizing the invention;

FIG. 2 is a fragment of the carburetor of FIG. 1 with parts broken away and shown in section;

FIG. 3 is an enlarged fragment of FIG. 2;

PEG. 4 is a view of FIG. 3 as viewed from the right;

FIG. 5 is a perspective illustrating the assembling of certain parts; and

FIG. 6 is an enlarged section taken on line 8--8 of FIG. 1.

Corresponding reference characters indicate correponding parts throughout the several views of the drawings.

Referring to FIG. 1 of the drawings, there is indicated a multi-stage carburetor 3 of the type referred to as a four-barrel carburetor. At 7 is indicated the air horn of the carburetor on which is conventionally mounted an air filter. The carburetor 3 has a primary mixture conduit 11 and a secondary mixture conduit 13 (see FIG. 1). At 15 is indicated the choke valve in air horn '7 on choke valve shaft :17. In the primary mixture conduit 11 is a fuel nozzle 19 and in the secondary mixture conduit 13 is a fuel nozzle 21. These fuel nozzles are adapted to be supplied in the usual manner from the fuel bowl of the carburetor, which appears in FIG. 2 at 23. As will be understood, a substantially constant level of fuel is maintained in the fuel bowl by means of a float-controlled needle valve, the float appearing at 25 in FIG. 2.

In the lower end of the primary mixture conduit 1-1 is the primary throttle valve 27 on primary throttle valve shaft 29. In the lower end of the secondary mixture conduit is the secondary throttle valve 31 on secondary throttle shaft 33. At 35 is indicated a choke mechanism connected by a link 37 to an arm 39 on the choke valve shaft 17 at one side of the carburetor. At this side of the carburetor, the primary throttle shaft 29 carries the inner and outer throttle shaft arms 41 and 43 and throttle shaft dog 45 held on by a screw 47. The secondary throttle shaft 33 carries the secondary throttle lever or arm 49 held on by a screw 51. The inner throttle shaft arm 41 is connected to the secondary throttle lever or arm 49 by a link 53. At the other side of the carburetor, the primary throttle shaft 29 carries a manually operated primary throttle lever (not shown).

The carburetor is formed with an accelerating pump cylinder 61 (see 'FIG. 2) in which is reciprocable a pump plunger or rod 63 carrying the packing 65 at its lower end. The plunger or rod 63 is slidable in an opening 67 in the air horn section and has a lateral hole 69 at its upper end. The air horn section is formed with an upwardly extending boss 71 (see FIGS. 2 and 5) adjacent the opening 67 which constitutes a support for a pump rocker 73. The rocker is constituted by a sheet metal lever having a central web portion 75 and arms 77 and 79 formed as flanges on the web portion, arm 77 extending forward toward the plunger 63 and arm 79 extending rearward away from the plunger. Rocker arms 77 and 79 are spaced a distance somewhat greater than the thickness of the boss 71. Arm 77 and plunger 63 are movable substantially in a common vertical plane (see FIG. 4). The boss has a tapped lateral hole 81 for receiving a headed pivot screw 83 for pivotally mounting rocker 73 on the boss. In the completed as sembly, this screw extends through a hole 85 at the forward end of rocker arm 79 and through the hole 81 in the boss, and has a reduced end portion 86 extending through a hole 87 at the rearward end of rocker arm 77. The forward end of arm 79 is located on one side of the boss, the rearward end of arm 77 on the other side of the boss, and web portion 75 straddles the top of the boss. A link 89 connects the lever 55 to the rearward end of rearward arm 79, this link having a laterally extending end portion 91 received in a hole 93 in arm 79. A link 95 of this invention connects the forward rocker arm 77 to the pump plunger 63, the arrangement being such that when the lever 55 is swung in throttle-opening direction, the pump plunger 63 is driven down through a discharge stroke.

In accordance with this invention, link 95 is constituted by a rod of circular cross section bent to S-shape. Accordingly, ithas a central portion 97, arms 99 and 101 extending radially in opposite directions from the ends of central'portion 97, and end portions 103 and 105 extending laterally in opposite directions from the ends of arms 99 and 101 parallel to central portion 97. Arms 99 and 101 may be angled relative to one another as appears in FIGS. 2 and 3. End portion 103 is received in a hole 107 at the forward end of rocker arm 77. End portion 105 is received in the hole 69 in plunger 63. The assembly is made asby inserting end portion 105 in hole 69 in the plunger 63 (already in place in opening 67 as illustrated in FIG. inserting end portion 103 in hole 107 in arm 77 of rocker 73 before the rocker is assembled with boss 71, then applying the rocker to straddle the boss with holes 85 and 87 in the rocker registering with the hole 81 in the boss, then threading the screw 83 in the hole 81 in theboss.

The screw 83 holds the rocker 73 on the boss while allowing it freely to pivot. The S-shaped link 95 is prevented from becoming disengaged from the plunger 63 and the arm '77 of the rocker by reason of the fact that lateral movement of the link toward the left as viewed in FIG. 4 is prevented by engagement of arm 99 of the link with the rocker arm 77 and lateral movement of the link toward the right as viewed in FIG. 4 is prevented by engagement of arm 101 of the link with the plunger 63. Engagement of link arm 99 with the rocker arm 77 prevents end portion 105 of the link from disengaging from hole 69 in the plunger. Engagement of link arm 101 with the plunger prevents end portion 103 of the link from disengaging from hole 107 in rocker arm 77. No fastener other than the screw 83 is required, and no machining of link 95 is required.

The S-shaped type of link is also useful for conmeeting the arm 41 on the primary throttle shaft 29 and the arm 49' on the secondary throttle shaft 33. Thus link 53 may be made like link 95, having end portion 103 received in a hole 109 in arm 49 and end portion received in a hole 111 in arm 41.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. A mechanical linkage comprising a support, a pair of spaced elements mounted on said support for movement in a common plane, means preventing lateral displacement of said movable elements, said movable elements having laterally spaced opposed faces, each of said elements being formed with a transverse bore penetrating said opposed faces with the bore of one element parallel to the bore of the other element, and a link connector between said elements, said link connector having oppositely extending parallel end portions extending into the bores formed in said movable elements, lateral portions extending from said end portions for abutting said opposed faces to prevent displacement of said end portions, and a connection between the ends of said lateral portions, said connection being positioned generally intermediate said oppositely extending parallel end portions.

2. The structure of claim 1 characterized in that one of said lateral portions for abutting an opposed face is angularly disposed with respect to the other lateral portion.

References Cited in the file of this patent UNITED STATES PATENTS 1,827,103 Penn Oct. 13, 1931 2,163,941 Dobson June 27, 1939 2,235,795 Carlson Mar. 18, 1941 2,340,820 Moseley Feb. 1, 1944 2,365,520 Bogue Dec. 19, 1944 2,635,863 Olson Apr. 21, 1953 2,668,696 Eberhardt Feb. 9, 1954 2,798,703 Carlson et al. July 9, 1957 2,839,220 Carlin June 17, 1958 2,890,032 Brown et a1 June 9, 1959 it'in 

